How do I retrieve my imail password

You can reset Apple ID password from iPhone by following the below article

If you forgot your Apple ID password - Apple Support

Resetting your iCloud Password will also reset you iCloud password as the login for iCloud emails is the same as your Apple ID account.

tad229 Said:

"How do I retrieve my imail password"

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Retrieving imail Password:

There is no such thing as an "imail password".

Getting Password from iCloud Keychain:

Use a Computer for this:

Have a Computer Handy? Perform this using a computer, as it would be more user-friendly doing so. Go Here: Manage Passwords Using Keychains on Mac - Apple Support